#pragma once
#include <iostream>
#include <unordered_map>
#include <functional>
#include <ctime>
#include <sys/types.h>
#include <unistd.h>

using task_t = std::function<void()>;

class TaskManager
{
public:
    TaskManager()
    {
        srand(time(nullptr));
        tasks.push_back([]()
        { std::cout << "sub process[" << getpid() << " ] 执⾏访问数据库的任务\n"
        << std::endl; });
        tasks.push_back([]()
        { std::cout << "sub process[" << getpid() << " ] 执⾏url解析\n"
        << std::endl; });
        tasks.push_back([]()
        { std::cout << "sub process[" << getpid() << " ] 执⾏加密任务\n"
        << std::endl; });
        tasks.push_back([]()
        { std::cout << "sub process[" << getpid() << " ] 执⾏数据持久化任务\n" 
        << std::endl; });
    }

    int SelectTask()
    {
        return rand() % tasks.size();
    }

    void Excute(unsigned long number)
    {
        if(number > tasks.size() || number < 0)
            return;
        tasks[number]();
    }

    ~TaskManager()
    {}
private:
    std::vector<task_t> tasks;
};

TaskManager tm;
void Worker()
{
    while(true)
    {
        int cmd = 0;
        int n = ::read(0, &cmd, sizeof(cmd));
        if (n == sizeof(cmd))
        {
            tm.Excute(cmd);
        }
        else if (n == 0)
        {
            std::cout << "pid: " << getpid() << " quit..." << std::endl;
            break;
        }
        else
        {
        }
    }
}